11-09-2020, 05:14 PM | #45 | |
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Are the X3 X4 M Comp dyno'ing 510whp? |
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11-09-2020, 05:18 PM | #46 |
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The M5C just squeaks into the 10s. The G8X should launch better but then likely lose some at the finish. Should be close and I suspect optimal conditions will be required.
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11-09-2020, 05:47 PM | #47 |
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You really think an AWD G8X will come close to matching an F90 M5 in the quarter mile?
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11-09-2020, 06:24 PM | #48 | |
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11-09-2020, 06:27 PM | #49 |
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Not really, no. The X3M’s 11.4 time is the only thing that let me believe an optimal condition G8X could come close as in maybe 11.1 if it carries 400 lbs less than the X3M and is significantly more slippery through the air.
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11-10-2020, 12:17 AM | #50 | |
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11-10-2020, 05:32 AM | #51 |
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Agreed. That "old relic" is a "pre imperial" design with an outdated hyper drive.
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11-10-2020, 08:36 AM | #52 |
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11-10-2020, 08:38 AM | #53 |
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Agreed. I couldn't help but make a Star Wars joke, however.
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11-12-2020, 07:28 AM | #54 |
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Reading on the F80 forum that the newer ECUs seemed to be locked down again. Would be a big blow to the drag racers if you have to go back to only piggybacks.
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11-12-2020, 11:33 AM | #55 | |
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11-13-2020, 11:45 AM | #56 | |||
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The M8 is literally a few seconds off of the F82 M4 GTS LOL. 7:32 versus 7:27. The new G8x is going to destroy all of these times, it's 500 lbs lighter than that M8 and BMW always puts it's biggest effort in terms of track times on the M3/M4. |
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11-13-2020, 12:08 PM | #57 | |
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The M8competition does not weigh 4,500lb. The one tested by AM&S for their 'ring supertest weighed 4,169lb (1,891kg), that's ~285lb more than the quoted 3,890/3,880lb official weight of the 2WD G80/82competition. Not 500lb. The M8competition has a massive 14% power-to-weight advantage over the RWD G8Xcompetition, this will be even more so compared to an AWD G8X. A 2WD G8X has less than a 1% power-to-weight advantage over an F82 M4cs, and a 8% deficit to the M4GTS. The G8X is unlikely to "destroy all of these times" (at least not until they release CS/CSL versions). A lot of blind "fanboism" going on in these threads...
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11-13-2020, 02:45 PM | #58 | ||
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11-15-2020, 01:37 PM | #59 | |
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When trying to develop the acceleration curve for the X3MC it came reasonably close when the base power/torque was increased from the released numbers of 503HP/442lb-ft to what was being seen by actual dyno numbers of ~546HP/496lb-ft. Making an assumption that BMW is underestimating the G80's numbers as well, I used this HP/torque info as a simple estimation. Correcting for what I know we are currently documenting in the X3MC stock c/w the Sim, it suggests the G80 M3C could run 3.3xxs 0-60mph, and 11.2xxs at 126mph in the 1/4mile. As comparative reference, the X3MC stock record in our Sub-Forum is 11.618s at 117.72mph by robopp. It will be interesting to see what your group finds with G80 dynos as more get tested in the field, as the Sim has usually been within 1-2mph of max speed as reported by BMW for almost every model I've run. But if the increased HP/torque numbers from our X3MC experience is used for the G80 as I did today, it shows the M3C capable of 191.7mph, nearly 12 mph faster than BMW's 180mph. So am curious if the G8x series dynos closer to what BMW is actually reporting, unlike our F97/98 findings so far. Looking forward to seeing your data. |
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11-15-2020, 01:42 PM | #60 | ||
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11-15-2020, 02:22 PM | #61 | |
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11-15-2020, 11:37 PM | #62 | |
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11-16-2020, 04:46 AM | #63 | |
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11-17-2020, 01:53 PM | #64 | |
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I've read that the G80 is 125mm longer and also a bit wider than it's predecessor, with majority of extra length between the wheel base. But even these added dimensions would not add up to 350lbs gain. What else has become so heavy ? no carbon propshaft anymore maybe ? Bulletproof glass or armored plating ? You can talk all the numbers you want but in the end -for a track oriented car- more weight will require wider tires, bigger brakes, resulting in more weight again... and once you step over the line of adhesion, it takes much more energy to dissipate before you gain grip again. You need a lot of extra grip to compensate for 200kg at 1.5G taking a corner. |
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11-17-2020, 02:41 PM | #65 | |
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If we round to 1% and 4000 lbs we still just get 40lbs so “most of the weight” is a bit misleading. |
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11-17-2020, 02:42 PM | #66 | ||
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AM&S/SA weighed a well optioned DCT F80 at 3582lb (1625kg) with a 52.1/47.9 distribution. The official specs for the G80C are 3890lb with a 53.1/46.9 distribution. Doing the math the F80 carries 1866lb on the front axle while the G8X 2066lb. So the G8X carries 200 of its 308 added lbs on the front axle. Quote:
There's always been some sort of weight reduction effort on ///M cars to offset the weight of the added go-fast goodies. However, particular effort was made on the F8X to reduce weight over the F3X baseline, where the F8X ended up even weighing less than the top series F3X.
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